What is Belt: Definition and 230 Discussions

A belt is a loop of flexible material used to link two or more rotating shafts mechanically, most often parallel. Belts may be used as a source of motion, to transmit power efficiently or to track relative movement. Belts are looped over pulleys and may have a twist between the pulleys, and the shafts need not be parallel.
In a two pulley system, the belt can either drive the pulleys normally in one direction (the same if on parallel shafts), or the belt may be crossed, so that the direction of the driven shaft is reversed (the opposite direction to the driver if on parallel shafts). As a source of motion, a conveyor belt is one application where the belt is adapted to carry a load continuously between two points. The belt drive can also be used to change the speed of rotation, either up or down, by using different sized pulleys.

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  1. W

    Kinematics Belt and Pulley Problem

    Homework Statement I think I made a mistake somewhere.. Homework Equations T = Jα T = F*R The Attempt at a Solution A) I started with T = Jα Since there is no slip, αm = αL Thus: Tm / Jm = TL / JL Plugging in, we find TL = Tm * JL / Jm = 2560 Now use T = F*R. Tm = Fm * Rm Plugging in...
  2. F

    How Does a Leather Belt Keep Baggy Jeans in Place?

    Homework Statement Your leather belt holds up your baggy jeans. How? What happens when you change variables such as making the belt wider, more narrow, thicker, or adding elastic?[/B] Homework Equations N/A The Attempt at a Solution Reducing diameter of the belt by tightening inreases friction?
  3. A

    I Can we colonize the Kuiper Belt?

    There is much sci-fi and techie talk of colonising Mars, or the Moon, and giant space habitats as far as the Asteroid Belt. But as you venture further out the Sun's power diminishes proportional to the square of the distance, and the solar panels that power all this life become extremely...
  4. R

    Dynamics Question -- packages discharged from a conveyor belt

    Homework Statement A series of small packages, each with a mass of 4 kg, are discharged from a conveyor belt as shown. Assume that the coefficient of static friction between each package and the conveyor belt is 0.4. Determine the force exerted by the belt on a package just after it has passed...
  5. D

    Projected Block and Conveyor Belt

    Homework Statement It is a Matching Type Problem(a single entry in a column can be matched with more than one in the other column):- A block is projected with an initial velocity ##v_{\text{Block}}## on a long conveyor belt moving with velocity ##v_{\text{Belt}}##(at that instant) having...
  6. Prasad birari

    Automotive Why automotive alternators are mostly driven by belt drives

    I am trying to list down all possible reasons because of which gear train drive is not preferred for driving alternators in automobiles, can you suggest some?
  7. B

    Does a Belt drive actuator isolate motor vibration?

    Trying to build a case for a belt driven ball screw axis versus a Planetary gear box, with the fact that the motor vibration would carry down the gearbox to the axis, but the timing belt drive would isolate the motor vibration. How would I model this? and ideally a way to get a factor of...
  8. eurus

    B Exploring the Asteroid Belt: Understanding Size and Composition

    Can someone please help me in calculating the total size in km of the Asteroid Belt? I have read the Asteroid Belt if lumped together would create a planet 4 times the size of Earth, however, I am trying to validate these numbers and am having difficulty in doing so. Here are the facts I have...
  9. Chris Frisella

    B Van Allen Belt "mirror points"-- How do these work?

    I was studying the Van Allen Belt, and I get it except for the mirror points (see picture). What would cause the particle to be deflected or turned around? Seems to me it would just continue towards the Earth getting tighter and tighter around the field line...
  10. BrahimBC

    I have a problem with a belt conveyor --

    Hi, everyone I have a mechanical problem I hope someone can help me out The project of internship is "Normalization of belt in a belt conveyors" , I explain ; the factory where I'm now have 69 conveyors each one use a belt different from the other , so my goal is to reduce the number of belt...
  11. T

    Testing Six Sigma Green Belt Certification, CompTIA A+, & more

    Hi People, I'm being scheduled to take the Six Sigma Green Belt Certification exam sometime in the summer 2017. They already have the registration deadlines/dates up for 2017 already. It's an Open-book, open-notes, calculator-allowed test according to what I've been reading online. I'm...
  12. T

    Proving trigonometric identities in a belt and pulley proble

    Homework Statement verify that theta in L = piD + (d-D)theta + 2Csin(theta) is equal to arc-cosine [(D-d)/2C] 2. The attempt at a solution you can see my attempt in the second picture uploaded. i don't think i even got it right
  13. L

    Force required to pull a curtain out/in?

    Hi there, I am currently trying to work out what force I will need to pull the curtain out and in (in the system shown in the attached illustration) so that I can calculate the torque required to turn the black cylinder component and therefore find out what motor I will need. I am simply...
  14. R

    How to investigate pulleys and belt

    Hi. Me and my team are re-building a human powered aircraft's transmission system, and are currently designing the part of the pulley and belt. We've bought the belt and pulley quite some time ago from different shops, thus, we now have to re-investigate whether the pulley and the belt match...
  15. J

    Optimizing Precision in Stepper Motor Driven Gear Systems

    I am driving 2 different gears with a belt off of a stepper motor that has a step angle of 0.018 degrees. For the purpose of my project, I need to have high precision between the stepper motor and the gears that it's driving. Is it necessary to have 20,000 teeth (360/0.018) on the gear that's...
  16. T

    Belt Driven Spindle: Calculating Power & Choosing Speed/Diameter

    The system is similar to above. Say I have calculated the required power at the spindle and various speeds (rpm) the spindle needs to run at. I am not sure on how to choose the constant speed of the counter shaft. For the motor HP i am thinking it is just Pmotor = Pspindle/Efficiency. Also not...
  17. V

    Torque required to rotate 5 flywheels connected with 1 belt

    Hi, I have 5 machines with flywheels, which are connected with one single belt, so that all five flywheels rotate together. Torque required for each flywheel to rotate is 300 Nm and rpm is 500. what would be the total torque required to rotate five flywheels connected with one belt?
  18. P

    Inelastic Collisions and the Limitations of Conservation of Energy

    Homework Statement Sand runs from a hopper at constant rate dm/dt onto a horizontal conveyor belt driven at constant speed V by a motor. (a) Find the power needed to drive the belt. (b) Compare the answer to (a) with the rate of change of kinetic energy of the sand. Can you account for the...
  19. J

    Power needed to keep conveyor belt moving at constant speed

    1. The problem statement, all variables and given/known Homework Equations P=Fv K.E = 1/2 mv2 The Attempt at a Solution This is the examiner report: Why infinite acceleration? Is it because the mass is too small?
  20. J

    Torque: Two pulleys wheels connected by a belt

    Homework Statement Ok, so first I find the tension on the top portion of the belt.. 3.0=T(100/1000) , T-> tension T=30N , though I'm not sure if taking the diameter of Q is correct. Then I find the torques on wheel P, which I multiply the tension with the radius (150/2 mm) which I get 4.5 Nm...
  21. G

    What are the dangers and jobs of living in the asteroid belt?

    So far i imagine things as following : instead of spinning up the whole rock, they have a spin station nearby, and build really big structures in microgravity, hangars for ships, factories etc. Due to lack of biosphere, it is common to reprocess dead bodies to food, fergitilizer. Questions ...
  22. S

    How to find shaft torque for belt pulley arragement?

    I am facing problem in calculating the shaft torque for my system. Motor is driving pulley and that pulley is coupled with belt with another big pulley (please refer attached file image). Motor power 19.4 kw, Torque- 71.8 Nm, Motor Rated speed- 2580 rpm, motor shaft dia=42mm Pulley dia (refer...
  23. T

    Seat belt as a kill switch: need suggestions

    So I'm planning on making the seat belt to work as a kill switch for an automobile using a Reed switch and a magnet. But I'm confused as to whether I should buy or make one. If I should buy it where should I go? Please give me your suggestions as I have to find the most efficient way and I have...
  24. A

    Tension in Conveyor Belt due to weight placed on it

    Hello, I am trying to determine the tension in a belt conveyor transporting material to calculate the motor power required and also tensioning force needed on it. I wanted to know how the material weight that is being carried affects it. I considered the tension to be equal to the friction...
  25. S

    Effect of Increase in Load Torque on Belt Tension & Power

    Homework Statement What would be the effect on the following if the load torque is increased and the speed maintains constant: a) the tension in the tight side of the belt b) the tension in the slack side of the belt c) the power transmitted Homework EquationsThe Attempt at a Solution I...
  26. C

    Coefficient of friction of a flat belt and of a vee belt

    Homework Statement Coefficient of friction of a flat belt and of a vee belt Homework Equations I know the lap angle, m2, T2, T1/T2 and ln (T1/T2) for the flat belt and lap angle, m2, T2, T1/T2 and ln (T1/T2) The Attempt at a Solution I attempted to find it by plotting a graph using the lap...
  27. B

    Belt Friction Statics: Solving for Belt Tension with Given Parameters

    Homework Statement http://oi59.tinypic.com/2lacy0o.jpg Homework Equations P = ? T2/T1 = e^(u)(θ) M = 150 N*m The Attempt at a Solution [/B] T2/T1 = e(.4)(7π/6) T2/T1 = 5.466 I don't even think I'm on the right track.
  28. J

    How Do Pulley Tensions Affect Performance?

    Hi I am new to this site, I'm currently studying my Engineering Foundation degree and I am massively struggling on the theory side to pulley tensions. Please could anybody point me to some sites or some information which would help me understand and answer this question in detail. I have not...
  29. V

    Crossed Belt and Rotational Dynamics: Solving for Angular Velocity and Torque

    Homework Statement http://imageshack.com/a/img908/282/eCETrh.png The green support turns clockwise at +w around the white fixed axis. The stator of the motor is fixed on the support. The stator of the generator is fixed on the support too. The motor drives the generator with a crossed belt...
  30. D

    The Angular Velocity in Belt Drives

    Consider the belt drives, the driven pulley: diameter d1, angular velocity w1 and the follow pulley: diameter d2, angular velocity w2. Assuming that the driven pulley rotate with a constant angular velocity and the belt does not slip on the pulleys, we have w1/w2=d2/d1, so w2 is constant(...
  31. B

    Innovative Elevator Design: Pulley & Belt System

    I am designing an elevator system and i wanted to use timing belts with a counterweight. After almost fully completing the design it was brought to my attention that my pulley and belt setup was not the best choice. Any insight on what anyone thinks would be great! The top pulley and belt...
  32. C

    Force, torque with a motor + a wheel + a belt

    Homework Statement [/B] A motor accelerates more and more a wheel without friction. It is supposed the belt gives forces F1 and F2 at only one point. http://imageshack.com/a/img674/1437/Uh0XIp.png Homework Equations None The Attempt at a Solution I would like to know if I drawn all...
  33. gauss44

    Van Allen Belt: Why are electrons generally further out?

    Why are electrons generally further out than protons in the Van Allen Belt?
  34. J

    What is the difference in torque produced by a wrench versus a belt?

    Hello All I have recently been trying to get my head around torque and think I am getting there. but I am struggling to understand the different of using a wrench to move an object i.e a bolt and using a belt to move something ok i.e an alternator. I don't get is it the entire lenth of...
  35. B

    Question about power loss in belt transmission

    Howdy all! In some project I do,I need to design belt transmission,now the tricky part is: On the output of the belt,I have wheel that needs to turn at 700 rpm,and I need to deliver power of 6KW. Now the weird question:I need to design the belt transmission so I will have 20 percent power loss...
  36. F

    Plane on conveyer belt question (with video)

    My initial thought was that the plane wouldn't be able to take off. If the conveyor is moving in the opposite direction as the plane, at the same speed, then the plane wouldn't move relative to the ground (as if you're running on a treadmill, you're not actually changing position relative to the...
  37. O

    Comparing Belt & Gear Systems for Power Transfer

    What are the factors to take into account when deciding between using a belt or a gear system for transferring power? Thanks
  38. PhysicoRaj

    Find the force on a conveyor belt

    Homework Statement Sand is being poured onto a conveyor belt at the rate of 2kgs-1. Find the force required to move the belt at an acceleration of 3ms-2. Given the sand is not dumped off the belt at any point and the mass of the conveyor is negligible. Homework Equations F=ma=dP/dt...
  39. C

    Serpentine Belt Analysis Homework: Length & Motion Equations Explained

    Homework Statement Here is what the belt system looks like. The first part of the problem is to prove that the length of the belt between pulleys is assuming a negative radius for the backwrapped pulleys (idler and tensioner). The second part is to derive the equations for...
  40. C

    Pluto Regains Its Title as Largest Object in the Edgeworth-Kuiper Belt

    Rejoice, Pluto fans! Distant world surpasses its rival, Eris, in new analysis. Link: ScienceNOW
  41. Z

    Cloth belt against Rubber coefficient of friction

    Does anyone know where I can get those values? Haven't been able to find them anywhere
  42. B

    Energy to move an object along a conveyor belt

    Hey phys community. need a little help, I am looking to calculate the energy needed to move an object from point A to point B on a conveyor belt. I need to know how to calculate this on a horizontal surface, incline, and decline. The abstract would be cool formulas would be cool. My math...
  43. Dotini

    Odd Body in Asteroid Belt with 6 Tails

    http://www.nasa.gov/content/goddard/hubble-sees-asteroid-spouting-six-comet-like-tails/#.UnvGoHemYRc Hubble photos http://www.nasa.gov/press/2013/november/nasas-hubble-sees-asteroid-spouting-six-comet-like-tails/ NASA press release
  44. R

    Package Dropped On A Conveyor Belt

    Homework Statement A package is dropped on a horizontal conveyor belt. The mass of the package is 4m , the speed of the conveyor belt is 3v , and the coefficient of kinetic friction between the package and the belt is 2k . a) How long does it take for the package to stop sliding on the...
  45. karush

    MHB Linear and angular velocity of 2 pulleys and a belt.

    A belt contects two pulleys with radii $\displaystyle5\text { in}$ and $3\text { in}$ the $\displaystyle5\text { in}$ pulley is rotating at $\displaystyle\frac{1000\text{ rev}}{\text{min}}$ What is the linear $\displaystyle\text{v}$ in $\displaystyle\frac{\text{ft}}{\text{sec}}$ of the belt...
  46. karush

    MHB Angular speed of 2 pulleys on a belt

    two pulleys connected by a belt have 15cm and 8cm radius The larger pulley rotates $25$ times in $36$ sec, Find the angular speed of each pulleey in radians per second. the 15cm pulley has circumferce of $30\pi$ so $\displaystyle\frac{25\text { rev}}{36 \text {sec}} \cdot\frac{30\pi\text{...
  47. karush

    MHB Calculating Angular and Linear Speeds of Pulley and Belt

    A pulley has a radius of $12.96\text { cm}$ it takes $18\text { s}$ for $56\text { cm}$ of belt to go around the pulley. (a) find the angular speed of the pulley in $\displaystyle\frac{\text {rad}}{\text{s}}$ well from $\displaystyle\frac{56\text { cm}}{18\text{ s}} \approx \frac{3.11\text {...
  48. A

    Collisions Of Two Asteroids in the Main Asteroid Belt.

    Homework Statement If there are two asteroids A and B of equal mass (and density of 3000kg/m^3), with the same semi major axis of a=2.2 AU with asteroid A having a circular orbit and no inclination, and asteroid B has an elliptical orbit with an eccentricity of e=0.05 and an inclination of...
  49. Y

    How does friction affect tension in a statics problem involving belt friction?

    Homework Statement Homework Equations T1/T2=eμs*β where T2 is the larger tension and β is the angle between the tensions.The Attempt at a Solution Isolating each pipe: W1 = 50*9.81 = 490.5N For pipe B, β = (2π)/3 For pipe C, β = π/3 For pipe B, T2 = 490.5N, so I have: 490.5/T =...
  50. M

    With ME under my belt, I have 3 options

    Hi I recently received my bachelor degree in ME and now I am facing a dilemma for my masters. I originally wanted to go into MSE abroad, but because of VISA issues I won't be able to attend although I got admitted. I have 3 choices: Materials Engineering, Condensed Matter Physics and...
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